266 A TEXT-BOOK OF GRASSES 



Nash, Revision of the Genera Chloris and Eustachys in North 



America (Op. cit. 25: 432-450. 1898). 



Nash, Revision of the Genus Triplasis (Op. cit. 25: 561-565. 1898). 

 Piper, North American Species of Festuca (Contr. U. S. Nat. Herb. 



10: 1-48. 1906). 



Scribner, The Genus Sphenopholis (Rhodora, 8: 137-146. 1906). 

 Scribner & Merrill, North American Species of Chsetochloa (U. S. 



Dept. Agr. Div. Agrost. Bull. 21. 1900). 

 Scribner & Smith, Native and Introduced Species of the Genera 



Hordeum and Agropyron (U. S. Dept. Agr. Div. Agrost. Bull. 



4: 23-36. 1897). 

 Shear, Revision of the North American Species of Bromus Occurring 



North of Mexico. (U. S. Dept. Agr. Div. Agrost. Bull. 23. 



1900). 

 Smith, Synopsis of the Genus Sitanion (U. S. Dept. Agr. Div. 



Agrost. Bull. 18. 1899). 



